FR660823A - Perfectionnements aux gramophones, haut-parleurs et instruments analogues - Google Patents

Perfectionnements aux gramophones, haut-parleurs et instruments analogues

Info

Publication number
FR660823A
FR660823A FR660823DA FR660823A FR 660823 A FR660823 A FR 660823A FR 660823D A FR660823D A FR 660823DA FR 660823 A FR660823 A FR 660823A
Authority
FR
France
Prior art keywords
gramophones
loudspeakers
similar instruments
instruments
similar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Application granted granted Critical
Publication of FR660823A publication Critical patent/FR660823A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR660823D 1927-09-23 1928-09-22 Perfectionnements aux gramophones, haut-parleurs et instruments analogues Expired FR660823A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB660823X 1927-09-23

Publications (1)

Publication Number Publication Date
FR660823A true FR660823A (fr) 1929-07-17

Family

ID=10490900

Family Applications (1)

Application Number Title Priority Date Filing Date
FR660823D Expired FR660823A (fr) 1927-09-23 1928-09-22 Perfectionnements aux gramophones, haut-parleurs et instruments analogues

Country Status (1)

Country Link
FR (1) FR660823A (fr)

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